首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
医学
Genetically modified crops and foods having been launched by big companies bent on taking over agriculture, this new breakthroug
Genetically modified crops and foods having been launched by big companies bent on taking over agriculture, this new breakthroug
admin
2013-11-30
35
问题
Genetically modified crops and foods having been launched by big companies bent on taking over agriculture, this new breakthrough in science poses a new problem—whether it’ s safe for people to eat them. Experts say that much of the current angst over genetically modified foods is unnecessary. If research and development are allowed to continue, the products will be there for all to appreciate.
New varieties of rice and other crops, resistant to insects and diseases, will have replaced those cultivated today. Farmers will no longer lose substantial proportions of their harvests. The impact of these advances will be felt in the less developed countries. Health benefits will also come from plants genetically engineered to be more balanced nutritionally than those that have evolved through natural selection or been bred by traditional methods.
The potential medical spin-offs from plant biotechnology are considerable. A new generation of more potent vaccines, many against illness for which no vaccines have been available, will be grown in plants such as maize and bananas.
Malnutrition could be banished. Biotechnology can improve efficiency of food production and generate more nourishing crops.
Throughout the world, gardeners, vegetarians, and consumers will benefit from plant varieties resistant to spoilage, foods which reduce our dependence on animals, and cheaper and/or tastier products.
We should not, however, overlook potential hazards in altering our diets by genetic engineering. As with all other applications of science to human welfare, biotechnology is likely to have risks. Mistakes will probably be made.
Nevertheless, any analysis of the new techniques for ferrying genes between plants must surely conclude that they are being applied and controlled more stringently than any technology ever before.
Nearly 25 years ago, when scientists first learned to combine DNA from different sources, commentators warned of the iniquity of "opening Pandora’ s box". Among their horrific forecast were unstoppable epidemics and worldwide pestilence. None of these has come to pass, partly because genetic manipulation has not proved inherently dangerous.
In addition, regulatory committees have been set up to ensure that experiments are conducted in appropriately safe conditions.
The regulators’ task is not simply to allow research to go ahead unless potential hazards are obvious. It is to consider risks that could come to light later. Will a gene, introduced intorape to protect it against virus attack, also make the pollen grains more likely to cause hay fever? All proposals have to survive positive vetting of this sort before they are sanctioned.
Genetic engineering is far more precise—and thus predictable—than the gene movements which occur in nature. When plants fertilize and cross-fertilize in the wild, large numbers of genes are transferred in a haphazard fashion.
Biotechnology allows individual genes to be moved with precision from one plant to another. It is much easier to know how one gene will work in its new setting. The likelihood of unexpected consequences and the margin of error are correspondingly reduced. There is a chance, however remote, that a gene introduced into a particular plant at one time and location might have adverse consequences if it eventually gets into another plant distant in space and time.
Given the astronomical amount of random gene transfer which occurs through the biosphere such extreme caution is unwarranted. I believe most food producers—and eaters—would agree.
According to your common sense, which of the following technique do you think does not belong to the field of genetic engineering?
选项
A、Cloning.
B、Artificial insemination.
C、Invitro fertilization.
D、Heart bypasses.
答案
D
解析
A项“克隆”,B项“人工受精”,C项“体外受精”都与遗传工程有关。
转载请注明原文地址:https://kaotiyun.com/show/9CU3777K
本试题收录于:
医学博士外语题库考研分类
0
医学博士外语
考研
相关试题推荐
有关非ST段抬高心肌梗死的治疗方案,以下哪项正确
A、Thesizeofafamily.B、Thesourceofincome.C、Thebasichumanneeds.D、Thedeathofthebreadwinner.C录音讲到寿险数量的计量方法是用一家人的the
Physicsandchemistryhavefurnishedthetechniquesforbiologiststotaketheexplorationoflifetoitslogicalconclusion.Th
BythetimeIreachedmyresidency,I______treatingthepatientasawholehumanbeing.
ManyCanadiansenjoytheluxuryofalargeamountoflivingspace.Canadaisvast,andthehomesarelargeaccordingtothestan
Twelvehoursaweekseemedagenerous______ofyourtimetothenursinghome.
InthispartthereisanessayinChinese.Readitcarefullyandthenwriteasummaryof200wordsinEnglishontheANSWERSHEE
Childrenshouldavoidusingmobilephonesforallbutessentialcallsbecauseofpossiblehealtheffectsonyoungbrains.Thisi
Americanideas—democracy,freemarketswouldspreadandfosterpoliticalconsensus.
At9:00intheeveningonJanuary29,justasPresidentGeorgeW.BushwasabouttobeginhisfirstStateoftheUnionaddress,
随机试题
放弃;遗弃v.a________
家族性房颤的基因突变导致心肌细胞
下列降压药物中便秘发生率最高的药物是
[背景材料]某工程的分部工程网络进度计划工期(即要求工期)为29天,网络计划如图6—1所示。施工中各工作的持续时间发生改变,具体变化及原因见表6—1。该分部工程接近要求工期时,承包商提出工期延期19天的索赔要求并符合索赔程序。[问题]
某企业单步骤生产甲产品,该产品按实际成本计价。该企业采用定额比例法将产品生产成本在完工产品与月末在产品之间进行分配。2011年12月份有关甲产品成本资料如下:(1)本月完工产品直接材料定额成本31500元、直接人工定额成本19600元、定额制造费用168
诺奇公司是生产企业,兼营房地产开发业务,其2018年财务报表于2019年4月30日报出。2019年3月,会计师事务所对诺奇公司财务报表进行审计时,现场审计人员关注到其2018年以下交易或事项的会计处理:(1)自2018年1月1日起,诺奇公司将某生产用机器
某国外旅行社拟在北京设立常驻机构,根据《旅行社管理条例》,该机构的设立必须经()的批准。
综合国力
给定C语言的数据结构struct T { int w; union T { char c;int i;double d;)U; }; 假设char类型变量的存储区大小是1字节,int 类型变量的存储区大小是4字节, double
下列有关指针的用法中,错误的是()。
最新回复
(
0
)